AFS40-45 Chromite Ore Chromium 45%

Product Description:

AFS40-45 Chromite Ore Chromium 45%

Chromite sand is a special sand for foundry. It is a natural spinel dominated by chromite. After crushing, grinding and screening, it is divided into specified particle size, which is suitable for molding (core making) sand. Chromium ore can be divided into two grades according to chemical composition, first-grade Cr2O3 (>45%) and second-grade Cr2O3 (>35%).

feature:

1. Heating volume stability

2. High thermal conductivity

3. Strong alkali resistance

4. Solid phase sintering, non-sticky sand

Advantages of chromite sand

Compared with silica sand, chromite sand can avoid most castings sticking sand, so it can also save the cost of surface treatment. Furthermore, chromite can be recycled many times through different techniques.

Technical data sheet:

application:

1. Chromite sand in foundry industry

l Its properties make the material useful as core and foundry sand in high strength gray iron and steel foundries.

l High thermal conductivity makes it have good cooling performance, and low thermal expansion makes it have good dimensional stability.

l The alkalinity is close to neutral, a variety of resin binder systems and inorganic binders can be used, with high refractoriness and wide sieving distribution.

2. Chromite sand in steel industry 20-70#

l In steel production, chromite sand is also used as filler to protect the sliding nozzle of large ladles.

Chromium drainage sand is made from chromite sand and additives. It has the advantages of high specific gravity, good fluidity, high melting point, and no excessive sintering. In chromium drainage sand, when the addition of chromite is greater than 60%, the chromite is continuously distributed, and this distribution is conducive to the formation of a continuous sintered layer. At high temperature, FeO in chromite reacts to desolvate, forming secondary spinel, which causes the volume change of the sintered layer and produces cracks. In this way, when the slide plate is opened, the unsintered drainage sand under the nozzle will flow out rapidly, and the cracks in the sintered layer will expand rapidly, and the sintered layer will be completely destroyed under the action of hydrostatic pressure. , so as to achieve the purpose of automatic pouring. Most large steel mills use chromium drainage sand, which accounts for about 30% of the entire ladle drainage sand, especially the refining ladle drainage sand.

3. Chromite sand in the glass industry

l When ground into a fine powder, chromite sand can be used as a colorant in the production of green glass beverage containers.

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